《BS-EN-ISO-6975-2005.pdf》由会员分享,可在线阅读,更多相关《BS-EN-ISO-6975-2005.pdf(32页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS EN ISO 6975:2005 Incorporating Amendment No. 1 to BS 3156-11.1.2:1997 (renumbers BS as BS EN ISO 6975:2005) Natural gas Extended analysis Gas chromatographic method The European Standard EN ISO 6975:2005 has the status of a British Standard ICS 75.060 ? Licensed Copy: sheffieldun
2、 sheffieldun, na, Sun Nov 19 15:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 6975:2005 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 A
3、ugust 1997 BSI 17 February 2006 ISBN 0 580 28037 3 National foreword This British Standard is the official English language version of EN ISO 6975:2005. It is identical with ISO 6975:1997. The UK participation in its preparation was entrusted to Technical Committee PTI/15, Natural gas and gas analys
4、is, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate
5、them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “
6、International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with
7、 a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank page, pages 1 to 21 and a back
8、cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 16104February 2006 Renumbers BS 3156-11.1.2:1997 as BS EN ISO 6975:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:54:58 GM
9、T+00:00 2006, Uncontrolled Copy, (c) BSI BSI 17 February 2006i Contents Page National forewordInside front cover ISO foreword iii Text of ISO 6975 1 BS EN ISO 6975:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy:
10、sheffieldun sheffieldun, na, Sun Nov 19 15:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6975 May 2005 ICS 75.060 English version Natural gas Extended analysis Gas-chromatographic method (ISO 6975:1997) Gaz naturel Analyse tendue Mthode par
11、 chromatographie en phase gazeuse (ISO 6975:1997) Erdgas Erweiterte Analyse Gaschromatographisches Verfahren (ISO 6975:1997) This European Standard was approved by CEN on 17 April 2005. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givin
12、g this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versio
13、ns (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cy
14、prus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUR
15、OPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6975:2005: E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19
16、 15:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of ISO 6975:1997 has been prepared by Technical Committee ISO/TC 193, Natural gas, of the International Organization for Standardization (ISO) and has been taken over as EN ISO 6975:2005 by CMC. This European Standard shall be gi
17、ven the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2005, and conflicting national standards shall be withdrawn at the latest by November 2005. According to the CEN/CENELEC Internal Regulations, the national standards organiz
18、ations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slov
19、enia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 6975:1997 has been approved by CEN as EN ISO 6975:2005 without any modifications. EN ISO 6975:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO
20、 6975:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Contents Page Forewordiii Introduction1 1Scope1 2Normative references2 3Definitions3 4Principle4 5Analysis and analytical requirements5 6Procedures7 7Calibration and control chart
21、s7 8Calculations11 9Precision13 10Test report13 Annex A (informative) Determination of the response curves for the main components in a sample14 Annex B (informative) Further details on the matrices used in Annex A19 Annex C (informative) List of retention indices20 Annex D (informative) Bibliograph
22、y21 Figure 1 Resolution of two adjacent peaks4 Figure 2 Example of a control chart for nitrogen9 Figure 3 Example of a control chart for carbon dioxide10 Figure 4 Example of a control chart for ethane11 Table 1 Tolerance between concentrations of components in the WRM and sample6 Table A.1 F-table18
23、 Descriptors: Natural gas, gas analysis, determination of content, hydrocarbons, chromatographic analysis, reference sample. EN ISO 6975:2005 BSI 17 February 2006 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 17 February 2006 iii Forew
24、ord ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a techni
25、cal committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of e
26、lectrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 6975 was prep
27、ared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis of natural gas. This second edition cancels and replaces the first edition (ISO 6975:1986), which has been technically revised. Annex A to Annex D of this International Standard are for information only. EN ISO 6975:200
28、5 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank iv Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 17 February 2006 1 Introduction This International Standard describes t
29、he specifications that an accurate method for the complete and extended analysis of natural gas shall fulfil. The analytical methods involve injection of natural gas on to packed or open tubular (capillary) columns in one or more gas chromatographs. The components coming off the columns are detected
30、 by thermal-conductivity detector (TCD) or flame ionization detector (FID). Compared to other analytical methods, the extended gas-chromatographic analysis supplies considerable knowledge of the individual components in the natural-gas mixture. This allows quantitative measurement of particular comp
31、onents in the C6+ fraction and calculation of physical properties. Although the higher hydrocarbons influence physical properties such as calorific values and density by less than 0,3 % and 0,004 %, respectively, knowledge of them is required for evaluation of the pseudo-values for the C6+fraction.
32、In addition, vapour phase equilibrium calculations often require detailed composition data, especially of hydrocarbons with carbon numbers higher than 6. The simultaneous determination of benzene and other aromatics is needed for gas consumers using natural gas as a chemical feedstock since these co
33、mponents can interfere in some processes. 1 Scope This International Standard describes the specifications for the quantitative analysis of the following components of natural gas: helium hydrogen argon oxygen nitrogen carbon dioxide saturated hydrocarbons from C1 to C5 hydrocarbon fractions from C6
34、 upwards aromatic compounds as benzene and toluene The gas-chromatographic methods determine the components in the following ranges: This method is not intended for the determination of oxygen compounds (water vapour, methanol, glycols) or sulfur compounds. oxygen:0,001 % (n/n)to0,5 % (n/n) helium:0
35、,001 % (n/n)to0,5 % (n/n) hydrogen:0,001 % (n/n)to0,5 % (n/n) argon:0,001 % (n/n)to0,5 % (n/n) nitrogen:0,001 % (n/n)to40 % (n/n) carbon dioxide:0,001 % (n/n)to40 % (n/n) methane:50 % (n/n)to100 % (n/n) ethane:0,02 % (n/n)to15 % (n/n) propane:0,001 % (n/n)to5 % (n/n) higher hydrocarbons: The method
36、can measure hydrocarbon components from 106 (n/n) up to their maximum concentration, which is compatible with the requirement that the gas is free from hydrocarbon condensate at any pressure in the range 1 102kPa to 7 103kPa. EN ISO 6975:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15
37、:54:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 BSI 17 February 2006 It is not possible to make unambiguous identifications of hydrocarbons above C6. Even where “spiking” a gas mixture with known components shows where they elute, it cannot be stated with certainty that such a component is the o
38、nly one with that retention time. Unidentified components are classified according to the carbon number which the analysis indicates to be appropriate. While this is a necessary simplification, it does allow a reasonable quantitative value to be obtained. This method is intended for use in situation
39、s where the hexanes plus compositional breakdown and/or the complete analysis is desired. The method is not intended for dense phase gases whose pressure exceeds the cricondebar (critical condensation pressure), or for gas samples containing any measurable hydrocarbon condensate, liquid water or pro
40、cess fluid such as methanol or glycols (see ISO 6570-1 and ISO 10715). Gases which have been treated for transmission are unlikely to contain detectable levels of hydrocarbons above C12. Samples taken from nearer the well head, before the gas has reached gas treatment plants, may contain hydrocarbon
41、s to C16 or above. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agree
42、ments based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 5725-1:1994, Accuracy (trueness and precision) of
43、measurement methods and results Part 1: General principles and definitions. ISO 6142:1981, Gas analysis Preparation of calibration gas mixtures Weighing methods. ISO 6143:1981, Gas analysis Determination of composition of calibration gas mixtures Comparison methods. ISO 6326-1:1989, Natural gas Dete
44、rmination of sulfur compounds Part 1: General introduction. ISO 6326-2:1981, Gas analysis Determination of sulfur compounds in natural gas Part 2: Gas chromatographic method using an electrochemical detector for the determination of odoriferous sulfur compounds. ISO 6326-3:1989, Natural gas Determin
45、ation of sulfur compounds Part 3: Determination of hydrogen sulfide, mercaptan sulfur and carbonyl sulfide sulfur by potentiometry. ISO 6326-4:1994, Natural gas Determination of sulfur compounds Part 4: Gas chromatographic method using a flame photometric detector for the determination of hydrogen s
46、ulfide, carbonyl sulfide and sulfur-containing odorants. ISO 6326-5:1989, Natural gas Determination of sulfur compounds Part 5: Lingener combustion method. ISO 6570-1:1983, Natural gas Determination of potential hydrocarbon liquid content Part 1: Principles and general requirements. ISO 6974-1:, Nat
47、ural gas Determination of composition with defined uncertainty by gas chromatography Part 1: Guidelines for tailored analysis1). ISO 6974-2:, Natural gas Determination of composition with defined uncertainty by gas chromatography Part 2: Measuring system characteristics and statistics for data treatment1). ISO 6974-3:, Natural gas Determination of composition with defined uncertainty by gas chromatography Part 3: Determination of hydrogen, helium, inert gases and hydrocarbons up to C81). ISO 6974-4:, Natural gas Determination of composition with defined uncertain
链接地址:https://www.31doc.com/p-3745193.html